Characterisation of the MALT90 survey and the Mopra telescope at 90 GHz
We characterise the Millimetre Astronomy Legacy Team 90 GHz Survey (MALT90) and the Mopra telescope at 90 GHz. We combine repeated position-switched observations of the source G300.968+01.145 with a map of the same source in order to estimate the pointing reliability of the position-switched observa...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal Article |
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CSIRO
2013
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| Online Access: | http://hdl.handle.net/20.500.11937/18209 |
| _version_ | 1848749679155609600 |
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| author | Walsh, Andrew Foster, J. B. Rathborne, J. M. Sanhueza, P. Claysmith, C. Whitaker, J. S. Jackson, J. M. Mascoop, J. L. Wienen, M. Breen, S. L. Herpin, F. Duarte-Cabral, A. Csengeri, T. Contreras, Y. Indermuehle, B. Barnes, P. J. Cunningham, M. R. Britton, T. R. Voronkov, M. A. Urquhart, J. S. Alves, J. Jordan, C. H. Hill, T. Hoq, S. Brooks, K. J. Longmore, S. N. |
| author_facet | Walsh, Andrew Foster, J. B. Rathborne, J. M. Sanhueza, P. Claysmith, C. Whitaker, J. S. Jackson, J. M. Mascoop, J. L. Wienen, M. Breen, S. L. Herpin, F. Duarte-Cabral, A. Csengeri, T. Contreras, Y. Indermuehle, B. Barnes, P. J. Cunningham, M. R. Britton, T. R. Voronkov, M. A. Urquhart, J. S. Alves, J. Jordan, C. H. Hill, T. Hoq, S. Brooks, K. J. Longmore, S. N. |
| author_sort | Walsh, Andrew |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We characterise the Millimetre Astronomy Legacy Team 90 GHz Survey (MALT90) and the Mopra telescope at 90 GHz. We combine repeated position-switched observations of the source G300.968+01.145 with a map of the same source in order to estimate the pointing reliability of the position-switched observations and, by extension, the MALT90 survey; we estimate our pointing uncertainty to be 8 arcsec. We model the two strongest sources of systematic gain variability as functions of elevation and time-of-day and quantify the remaining absolute flux uncertainty. Corrections based on these two variables reduce the scatter in repeated observations from 12%–25% down to 10%–17%. We find no evidence for intrinsic source variability in G300.968+01.145. For certain applications, the corrections described herein will be integral for improving the absolute flux calibration of MALT90 maps and other observations using the Mopra telescope at 90 GHz. |
| first_indexed | 2025-11-14T07:24:46Z |
| format | Journal Article |
| id | curtin-20.500.11937-18209 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:24:46Z |
| publishDate | 2013 |
| publisher | CSIRO |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-182092017-09-13T13:43:07Z Characterisation of the MALT90 survey and the Mopra telescope at 90 GHz Walsh, Andrew Foster, J. B. Rathborne, J. M. Sanhueza, P. Claysmith, C. Whitaker, J. S. Jackson, J. M. Mascoop, J. L. Wienen, M. Breen, S. L. Herpin, F. Duarte-Cabral, A. Csengeri, T. Contreras, Y. Indermuehle, B. Barnes, P. J. Cunningham, M. R. Britton, T. R. Voronkov, M. A. Urquhart, J. S. Alves, J. Jordan, C. H. Hill, T. Hoq, S. Brooks, K. J. Longmore, S. N. instrumentation: spectrographs ISM: individual (RCW 65) telescopes radio lines: ISM H II regions astrochemistry We characterise the Millimetre Astronomy Legacy Team 90 GHz Survey (MALT90) and the Mopra telescope at 90 GHz. We combine repeated position-switched observations of the source G300.968+01.145 with a map of the same source in order to estimate the pointing reliability of the position-switched observations and, by extension, the MALT90 survey; we estimate our pointing uncertainty to be 8 arcsec. We model the two strongest sources of systematic gain variability as functions of elevation and time-of-day and quantify the remaining absolute flux uncertainty. Corrections based on these two variables reduce the scatter in repeated observations from 12%–25% down to 10%–17%. We find no evidence for intrinsic source variability in G300.968+01.145. For certain applications, the corrections described herein will be integral for improving the absolute flux calibration of MALT90 maps and other observations using the Mopra telescope at 90 GHz. 2013 Journal Article http://hdl.handle.net/20.500.11937/18209 10.1017/pasa.2013.18 CSIRO fulltext |
| spellingShingle | instrumentation: spectrographs ISM: individual (RCW 65) telescopes radio lines: ISM H II regions astrochemistry Walsh, Andrew Foster, J. B. Rathborne, J. M. Sanhueza, P. Claysmith, C. Whitaker, J. S. Jackson, J. M. Mascoop, J. L. Wienen, M. Breen, S. L. Herpin, F. Duarte-Cabral, A. Csengeri, T. Contreras, Y. Indermuehle, B. Barnes, P. J. Cunningham, M. R. Britton, T. R. Voronkov, M. A. Urquhart, J. S. Alves, J. Jordan, C. H. Hill, T. Hoq, S. Brooks, K. J. Longmore, S. N. Characterisation of the MALT90 survey and the Mopra telescope at 90 GHz |
| title | Characterisation of the MALT90 survey and the Mopra telescope at 90 GHz |
| title_full | Characterisation of the MALT90 survey and the Mopra telescope at 90 GHz |
| title_fullStr | Characterisation of the MALT90 survey and the Mopra telescope at 90 GHz |
| title_full_unstemmed | Characterisation of the MALT90 survey and the Mopra telescope at 90 GHz |
| title_short | Characterisation of the MALT90 survey and the Mopra telescope at 90 GHz |
| title_sort | characterisation of the malt90 survey and the mopra telescope at 90 ghz |
| topic | instrumentation: spectrographs ISM: individual (RCW 65) telescopes radio lines: ISM H II regions astrochemistry |
| url | http://hdl.handle.net/20.500.11937/18209 |